Allioniellopsis is an endemic, monospecific genus of the tropical Andes. Noteworthy features of Allioniellopsis include the homomallously arranged, numerous, small sporophytes with the peristome teeth represented only by a somewhat reduced hyaline bordered exostome. Only known from three collections, the original (type collection) made by Allioni in 1909, and two additional collections, one each from Ecuador and Peru from the lower eastern Andean slopes. The generic name honors I’abbé Michel Allioni who made excellent collections along the slopes of the Ecuadorian Oriente in the provinces of Azuay and Morona-Santiago; in 1911 Allioni, like Gustav Wallis 33 years earlier, died of yellow fever in Ecuador.